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mag card

[mag]
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noun
  1. Computers. a plastic or paper card with a magnetizable layer on which data can be recorded and from which data can be read.
  2. such a card used in access-control systems, as for automatically unlocking doors.
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Also called magnetic card.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018